| 摘要 |
PROBLEM TO BE SOLVED: To provide a forcing method for a thin walled tube sampler capable of stably sampling an undisturbed sample even if the ground has a bigger N value and accurately sampling the sample remaining in an undisturbed and natural state. SOLUTION: After a first wire rope 6 and a second wire rope 13 are made in a tension state by operating a winch 2, the operation of the winch 2 is stopped, and then, operation opposite to the operation is made to loosen the first wire rope 6, and the first wire rope is separated from a rope tongue 5. Then, a hydraulic pump 30 is operated to lower a spindle 7, the rope tongue 5 is lowered in succession at a constant speed by the second wire rope 13 accompanied by a roller 9 of a stroke double additional device 4 of the spindle 7, and a thin walled tube sampler 24 is pushed into the ground without applying load to a tripod oar.
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